Glow discharge lamp



May 26, 1942. D. cANADY GLOW DISCHARGE LAMP Filed Dec. 9, 1940 (Il. un- '/lllllA INVENTOR. on Cm Patented May 26, 1942 Y t NETE. D' STATES {PeTENf [L @,FFCE

GLOW DISCHARGE LAMP Don Canady, Cleveland, Ohio Application December 9, 1940, SerialNo. 369,253

c (c1. 11s-122) l Claim.

My invention relates broadly to glow discharge lamps containing a gas or gases, and more particularly to a glow discharge lamp having a canal or channel arrangement incorporated therewith for circulating a cooling medium, such as water or air, therethrough to carry off some of the heat developed in the electrodes while in operation.

This improvement is designed to increase the that the cooling fluid mayhave an unrestricted Y flow therethrough. The structure just described life of the glow discharge lamp, to stabilize its operation, to increase the lightoutput intensity, and to reduce the noise level in operation.

My invention will be described with referencel my invention.

Figure 2.is a sectional View of another form of a glow discharge lamp, in which the cooling canal constitutes one of the electrodes, and positioned so that its longest dimension is horizontal to the vertical axis of the lamp or tube.

Figure 3 is an end View of another form of a glow discharge lamp.

Figure 4 is a section taken on line A -A in Figure 3.

Figure 5 is an end sectional view showing another modincation wherein the constricted portion of the tube or lamp is divided so that the cooling medium may pass between them.

The glow discharge tube or lamp shownin Figure 1 comprises a bulb or envelope' I0 having therein an inner envelope II in which the cathode I2 isA mounted, insulated and sealed in any suitable practical manner. The cathode is made of suitable conductive material, preferably a metal, which preferably has ajcircular crosssection. The cathode may be surrounded by a ber 34, 34.

inlet V- and leave at the outlet 3E., or conversely.

constitutes a form of an upright Ushaped tube. The legs may be bent as shown at 23 and 24. The flow of the cooling medium may be in the direction `indicated by the arrows or conversely.

In the tube or lamp shown in Figure 2, the electrode 25 is a straight cylindrical metal tube, but may be rectangular or have any other suitable shape in cross-section without turn or curve. The tube duly functions as a conduit for the cooling fluidV and also as an electrode. The ends 26 and 21 of the electrode may be covered or coated with any suitable insulating material, for instance magnesia, micanite or mica which is indicated at 28 and 29. The cooling uid may flow through the electrode as indicatedby the arrows or conversely. The electrode 25 isr provided with `an opening 2,5, and is mountedv on the pinch or press 25X by means of the supporting rod As a variant the electrode 25' may be an velongated rod-like electrode.

In the tube or lamp shown in Figure 3 and the i sectional view of same in Figure 4, the tube is provided with a constricted passageway or capillary 3l, and theelectrodes 32 and 33 are'in alignment. The width or diameter of the constricted passageway is less than the diameter of the tube properand is centrally located as shown in Figure 3, so that the'cooling liquid can pass around it in passing through the cooling cham- The cooling liquid may enter at the The tube is Vlled with a noble gas or a mixture of noble gases, and when a current is applied through the electrodes the gas becomes luminous. At theconstricted portion of the tube where the current density is high, the light is much more tube I3 of insulating material to prevent the.

wardly extending wall I8 stopping short of theV length of the envelope as at I9 to provide a passageway ZIJ between the chambers 2| and 22 so The anode I4 is mounted uponv intense, hence in this region considerable heat is created. By enclosing the constricted area within a water jacket, the heat is readily dissipated. In Figure 5 the constricted portion of the tube is divided into two channels as at 3,1 and 38. The

cooling liquidr may enter the cooling chamber at the inlet 39 and leave by the outlet 4U, or vice versa, and in doing so it passes through the passageway 4I, provided between the constricted channels 31 and 38. This construction provides tion of my invention, together with the apparatus which I now consider to represent the best embodiments thereof, but I .desire to have it Y understood that the apparatus shown and described is only illustrative', `and that the inven-` tion may be carried out by other means.

What I claim as new and desire to secure -by Letters Patent of the United'Statesis: Y

, In a glow-dischargeflamp, the 'combination with a sealed vessel containing a gas charge,

. electrodes therefor, one4 of the 4said electrodesV being a straight hollow rcylindrical metallic mem- 10 therethrough.

DON CNADY; 

